Multimedia data communication method and system

ABSTRACT

A multimedia processing system is provided for communicating among a baseband module, an image sensor module, and at least one display module in a mobile phone. The system comprises: a serial baseband interface that transmits and receives processing data from the baseband module; an image sensor interface that transmits and receives image data from the image sensor module; a display interface that transmits and receives display data from the display module, wherein the display interface comprises a display write enable output, a display read enable output, and a display transceiver means to transmit and receive the display data; and at least one register that includes a clock phase control bit, a clock polarity control bit for assisting the serial baseband interface to accommodate different interface standards, and a burst read mode control bit for bursting the serial baseband interface to read sequential processing data from a multimedia module or from the baseband module.

CROSS REFERENCE TO RELATED APPLICATION

This is a continuation application of Ser. No. 11/453,158, filed Jun.13, 2006, entitled “MULTIMEDIA DATA COMMUNICATION METHOD AND SYSTEM”.

FIELD OF THE INVENTION

The present invention generally relates to a multimedia system forprocessing multimedia data. Particularly, certain embodiments of theinvention relates to a multimedia processor of a wireless mobile phonefor processing multimedia data among a baseband module, an image sensormodule, and at least one display module.

BACKGROUND OF THE INVENTION

Mobile phone dominates the phone market today and its number will soonsurpass that of the conventional wired telephone. Meanwhile, mobilephone equipped with camera has become a trend as well. Thus, only amobile phone system with reliable electrical properties and fashionableappearance will lead in today's market.

A mobile phone system with a camera is usually called a multimediamobile phone system. The multimedia mobile phone system normally has anRF (Radio Frequency) module, a baseband module, a camera, and one or twodisplay screens. The baseband module receives radio frequency signalsfrom the RF module; or it transmits radio frequency signals to othermobile phone systems or mobile phone stations with the assistance of theRF module. The RF module has an antenna to convert the radio frequencysignals into an electromagnetic wave. Conversely, it can receive anelectromagnetic wave and then convert the electromagnetic wave into aradio frequency signal for further processing by the baseband module.

In the baseband module, the radio frequency signal with high frequencycarrier is sampled out from the carrier. That is, the higher frequencyportion of the original radio frequency signal is filtered out. Thus,the filtered radio frequency signal falls in the range of basebandfrequency. The baseband module is an interface between wireless antennaand the digital portion of the mobile phone system, which processescalling information including video or audio signals or voice signalsfor users. Moreover, the baseband module can transmit text messages toothers through the RF module.

The baseband module may also control a display screen. The basebandmodule can send display information to the display screen and then showthe information on the screen, creating a friendly interface betweenusers and the machinery of the phone system. However, for a mobile phonewith multimedia functions, e.g., cameras or display panels, it usuallyrequires a multimedia module or processor. For example, the multimediamodule can process images captured by a digital camera. This digitalimage processing includes white balance, automatic exposure, or patternclassification based on the captured scenes. In another example, themultimedia module can process video signals from the baseband module,e.g., video information sent by a friend or a movie sent by a serviceprovider. The video may contain compressed video information includingAVI (Audio Video Interleave), MPEG 2 (Moving Picture Experts Group 2),or MPEG 4 compression format, and need to be decompressed on thereceiver's end. Besides the video compression standards mentioned here,there are also many compression standards relate to voice signals.

Today, the wireless mobile phones can further receive TV programs or GPS(Global Positioning System) directions from satellites. Obviously, themodern wireless mobile phone is no longer a simple device for voiceapplication only. In order to integrate desirable multimedia functionsinto a compact, mobile device, a scheme should be provided such that thecomplex multimedia mobile phone system can handle all data correctly andin real time.

Taiwan Pat. No. 1229,552 to Zhang, entitled “Method and apparatus withapplications for image data transmission,” discloses an apparatus thatbypasses image data from an image processor to a display device withoutbeing handled by a CPU (Central Processing Unit) to buffer the imagedata and send the image data to the display device. The disclosure ofwhich is hereby incorporated by reference. The function of the apparatusis similar to a DMA (Direct Memory Access) controller in a computerwhere the DMA controller bypasses the content of the memory to severalperipheral connected devices. The resources of the CPU are thereforesaved and can be used for other functions. However, the transmissionmethod described by this patent requires complex parallel data buses,and therefore, the interconnection between each components becomescomplicated.

Taiwan Pat. No. 1241,821 to Zhang, entitled “Mobile phone architectureand method thereof for performing voice service and capturing orwatching images simultaneously,” discloses a mobile phone architecturewith a switch control unit that can isolate a parallel communicationbetween a digital baseband unit and a display module to send image datafrom an image processing module to the display module. The disclosure ofwhich is hereby incorporated by reference. However, this patent onlyutilizes parallel scheme to transmit data between the digital basebandmodule and the display module. Moreover, the disclosure does not mentionhow to use a multimedia processor to construct a simplified mobile phonesystem with low cost communication scheme.

SUMMARY OF THE INVENTION

The present invention discloses a multimedia processing system forcommunication among a baseband module, an image sensor module, and atleast one display module in a wireless mobile phone. The multimediaprocessing system may comprise a serial baseband interface, an imagesensor interface, and a display interface. The serial baseband interfacetransmits and receives processing data between the multimedia processingsystem and the baseband module. The image sensor interface transmits andreceives image data between the system and the image sensor module. Thedisplay interface transmits and receives display data between the systemand the display module. In certain embodiments of the invention, theimage sensor interface or the display interface may be a serialinterface.

The present invention discloses a serial peripheral interface (SPI)comprising a clock signal, a data input, and a data output. The serialperipheral interface may further comprise a chip select input and aslave input. The serial peripheral interface may transmit or receivedata signals synchronously with the clock signal. Moreover, the serialperipheral interface may be replaced by a universal asynchronousreceiver and transmitter (UART) interface.

The present invention also discloses an image sensor interfacecomprising a horizontal data reference input, a vertical data referenceinput, and a plurality of sensor raw data inputs. The image sensor mayfurther comprise a clock signal and a transceiver means to transmit andreceive the image data.

According to one embodiment of the invention, the multimedia processingsystem has a display interface comprising a display write enable output,a display read enable output, and a display transceiver means to showthe display data on a display panel. The display interface may use aserial communication scheme comprising a clock signal and a transceivermeans to transmit and receive the display data. Moreover, a bypasssignal may control the display interface to bypass the incoming signalsto other connected devices directly. The multimedia processing systemmay also have at least one register to accommodate different interfaces.

According to another embodiment of the invention, a multimediaprocessing method that manages the transmitting and receiving of dataamong different modules is disclosed. The management of data, includingprocessing data, image data, and display data, may utilize a serialinterface scheme. The serial interface scheme may be a synchronous or anasynchronous scheme wherein the synchronous scheme may have a clocksignal which synchronizes digital operations.

BRIEF DESCRIPTION OF THE DRAWINGS

Various objects and advantages of the present invention will be morereadily understood by reference to the following detailed descriptionwhen read in conjunction with the accompanying drawings, in which:

FIG. 1 is a block diagram that describes an LCM (Liquid Crystal Module)interface with eight bits or sixteen bits data bus between a basebandmodule and a multimedia module in the prior art;

FIG. 2 is a timing waveform that describes the communicating operationsof the LCM interface in the prior art;

FIG. 3 is a block diagram that describes an LCD (Liquid Crystal Display)interface between a multimedia module and two LCD display modules in theprior art;

FIG. 4 is a block diagram that describes a multimedia phone system witha multimedia module communicating to at least one display module via aserial LCM bus, in accordance with an embodiment of the presentinvention;

FIG. 5 is a block diagram that describes a multimedia phone system witha baseband module communicating to at least one display module via aserial LCM bus, in accordance with an embodiment of the presentinvention;

FIG. 6 is a block diagram that describes an SPI (serial peripheralinterface) baseband interface, in accordance with an embodiment of thepresent invention;

FIG. 7 is a signal waveform that describes the communicating operationsof the SPI baseband interface when a register bit CPHA is set to logic0;

FIG. 8 is a signal waveform that describes the communicating operationsof the SPI baseband interface when a register bit CPHA is set to logic1;

FIG. 9 is a block diagram that describes an image sensor interfaceaccording to one embodiment of the invention;

FIG. 10 describes a wireless multimedia mobile phone system according toa preferred embodiment of the present invention; and

FIG. 11 describes a wireless multimedia mobile phone system according toone embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

FIG. 1 describes an LCM (Liquid Crystal Module) interface with eightbits or sixteen bits parallel data bus between a baseband module 2 and amultimedia module 1 in the prior art. A system in the prior art uses thebaseband 2 to transmit and receive processing data via a LCM interfaceto the multimedia module 1. The LCM interface generally comprises a chipselect signal MCS# 11, a register select signal MRS 12, a read enablesignal MRE# 14, a write enable signal MWE# 13, an interrupt signal MINT#16, and a clock signal CLK 17. The function of the chip select signalMCS# 11 is to activate the multimedia module 1, which may be a chip. Theregister select signal MRS 12 can be used to write commands in thecontrol registers of the multimedia module 1. It also controls functionssuch as entering a power saving mode, discarding some image data, orresetting some peripheral devices. The baseband module 2 will activateeither the read enable signal MRE# 14 or write enable signal MWE# 13when it needs to read or write processing data. In this example, thebaseband module 2 uses a parallel data bus MD[15:0]/[7:0] 15 withsixteen bits or eight bits to communicate data to the multimedia module1. For those skilled in the art, it is well known that the interruptsignal MINT# 16 and the clock signal CLK 17 are necessary for thegeneral microprocessors or microcontrollers to control the peripheraldevices. The LCM interface shown in FIG. 1 is only for illustrativepurpose. In fact, there is a need for more data buses in a multimediamobile phone system with diverse functions. Thus, it is an object of thepresent invention to address these complicated data buses.

FIG. 2 illustrates the operation timing of the LCM interface in theprior art. This figure shows that the baseband module 2 writesprocessing data to the multimedia module 1 through an LCM interface witheight bits data bus only. The chip select signal MCS# 11 turns low whenthe data on the data bus MD [7:0] 15 is ready to be written to themultimedia module 1. During cycle 1 and cycle 2, the register addressdata on the data bus MD [7:0] 15 are written to the multimedia module 1when the register select signal MRS 12 is set low. During cycle 3 andcycle 4, the register value data on MD [7:0] 15 are written. In thisexample, the rising edges of the write enable signal MWE# 13 trigger thelatching of the data on the data bus MD [7:0] 15. Other conditions, suchas utilizing sixteen bits data bus or operating under read mode, aresimilar to the above scheme and can be easily understood by thoseskilled in the art. Thus, their details are not going to be describedherein.

From the examples above, the prior art's parallel interface schemerequires many connecting wires, especially in the mobile phone systemthat has a high resolution display or a high quality voice requirement.The system needs to arrange these complicated connecting wires in acompact mobile phone. Noted that there are other devices that areintegrated in a mobile phone system, such as an IrDA (Infrared DataAssociation) interface, a memory card interface, and an USB (UniversalSerial Bus) interface. Thus, masses of connecting wires not only take upsubstantial inner spacing, they also create unwanted electromagneticnoises that can affect other electrical components as well as users.

FIG. 3 describes a prior art where an LCD (Liquid Crystal Display)interface is located between a multimedia module 1 and two LCD displaymodules 3, 4. In this figure, same reference numbers and annotations areused as in FIGS. 1 and 2. The multimedia module 1 transmits to andreceives display data from the LCD modules 3, 4 via the LCD interfacewhich contains a main LCD chip select signal LCS1# 31, a sub LCD chipselect signal LCS2# 36, an LCD register select signal LRS 34, an LCDwrite enable signal LWE# 32, an LCD read enable signal LRE# 33, and aplurality of display data bus LD [15:0]/LD[7:0] 35 which may be asixteen bits data bus or eight bits data bus. The signals may be input,output, or in-out signals depending on their applications. The in-outsignals perform both transmitting and receiving functions. In thisexample, the multimedia module 1 requires two sets of parallel controland data buses to control the display of the LCD modules 3, 4. Theoperations within the modules in this example are similar to thoseoperations in the LCM interface described in FIG. 1 and FIG. 2. Thecontrol and display data buses here also create the same electromagneticnoise problem as described in FIG. 1.

FIG. 4 describes a multimedia phone system with a multimedia modulecommunicating to at least one display module via a serial LCM bus 48. Inthis embodiment, a multimedia module 41 comprises a serial basebandinterface, an image sensor interface, and a display interface. Theserial baseband interface comprises a serial baseband bus 46. The imagesensor interface comprises a sensor bus 47. The display interfacecomprises a serial LCM bus 48. The multimedia module 41 communicatesinformation among a baseband module 42, an image sensor module 43, andat least one display module including a main LCM module 45 and a sub LCMmodule 44.

In another embodiment of the invention, the image sensor module 43 is aCMOS image sensor. However, the CMOS image sensor may be replaced by aCCD image sensor or other sensors well known to those skilled in theart. Similarly, the LCM modules 44, 45 are not limited to particularkinds of LCD display modules. Display modules which may include TFTdisplay modules, STN display modules, color STN display modules, organicLED (OLED), or other flat panel display modules may also be used.

The baseband module 42 converts incoming RF signals to signals that havefrequencies within the baseband range by removing the accompanying highfrequency carrier. The baseband module 42 then processes these basebandsignals and sends them to the multimedia module 41 via the serialbaseband bus 46. The processed signals may comprise control signals,voice data signals, video data signals, display data signals, or otherrelated telecommunication information. The control signals may furthercomprise user's instructions such as activating the image sensor module43, listening to radio broadcasting programs, or just pressing buttonson the mobile phone. The implementation of the serial baseband bus 46will be described later in another embodiment of the invention.

The multimedia module 41 fulfills the demanding multimedia functionsembedded in the mobile phone system. An application specific multimediamodule 41 can handle specific real-time functions, e.g., digital imageprocessing algorithm, voice compression, and video compression, withoutoccupying resources of the baseband module 42. In FIG. 4, the multimediamodule 41 transmits to or receives image data from the image sensormodule 43 via the sensor bus 47. To further reduce the conductive wires,the mobile phone system may employ a serial sensor interface tocommunicate image data between the multimedia module 41 and the imagesensor module 43.

The LCM bus 48 plays a role opposite to what the sensor bus 47 does. Theimage sensor module 43 mainly captures images and sends image data viathe sensor bus 47 to the multimedia module 41 for further processing. Onthe contrary, the display modules 44, 45 show what is captured by theimage sensor module 43 on the display screen. Most mobile phones havetwo display screens, one is a main display screen and the other is a subdisplay screen for displaying short messages without enabling the wholemobile phone system. The LCM bus 48 may be replaced by a serial LCM bus,like the serial sensor bus, to simply the display interface between themultimedia module 41 and the display modules 44, 45.

The multimedia module 41 may further comprise a bypass mechanism totransfer incoming data signals directly to other peripheral devices.This bypass mechanism accelerates data transfer when the data are inchangeless formats and simplifies presetting procedures. According toone embodiment of the invention, the bypass mechanism may comprise abypass signal 49 from the baseband module 42 to control the multimediamodule 41. The mechanism may bypass incoming processing data andtransfer them directly to the LCM bus 48 when the destination of theincoming processing data is the display modules 44, 45.

FIG. 5 describes a multimedia phone system with a baseband module 52which communicates to at least one display module via a serial LCM bus58 in another embodiment. In this figure, the reference numerals andannotations used are the same as in the previous figures. Here, amultimedia module 51 comprises a serial baseband interface and an imagesensor interface. The serial baseband interface comprises a serialbaseband bus 46. The image sensor interface comprises a sensor bus 47.The multimedia module communicates information between the basebandmodule 52 and an image sensor module 53. Furthermore, the basebandmodule 52 comprises a display interface which transmits display data toat least one display module including a main LCM module 55 and a sub LCMmodule 54 wherein the display interface may comprise the serial LCM bus58.

FIG. 6 describes an SPI (serial peripheral interface) baseband interfaceaccording to another embodiment of the present invention. A serialinterface transmits data serially. A serial interface comprises at leastone data line and one clock line. When triggered by the clock line, thedata line carries data from a host machine to a slave machine. The SPIbaseband interface shown in this figure, communicating data between abaseband module 62 and a multimedia module 61, is an exampleillustrating an implementation of the serial scheme. The serialcommunication scheme of the present invention is not limited to the SPIbaseband interface. Other serial interface schemes, such as UART(Universal asynchronous receiver and transmitter), are also applicable.

According to another embodiment of the invention, the burdensomeparallel interface is replaced by an SPI interface which only comprisesa slave select signal SS 64, a serial clock signal SCK 65, a masteroutput/slave input MOSI 66, and a master input/slave output MISO 67. Thebaseband module 62 uses a chip select signal MCS# 63 to select andenable the multimedia module 61. A ground GND 68 may be optional.

When the SPI interface is on slave mode, a control register 69,comprising a clock polarity control bit CPOL 610 and a clock phasecontrol bit CPHA 611, may assist the SPI interface to accommodatedifferent interface standards. The CPOL bit 610 can select anon-inverted or inverted clock signal generated from either the originalclock signal or supplied clock signal. The CPHA bit 611 can provide twodifferent protocols by shifting the original clock by a half cycle. Thecontrol register 69 may have more control bits. For example, there maybe control bits related to a burst read mode control. Thus, the SPIinterface may burst in to read sequential processing data either fromthe multimedia module 61 or from the baseband module 62.

FIG. 7 illustrates the communicating operations of the SPI basebandinterface when a register bit CPHA 611 is set to logic 0. The defaultsetting, logic 1 or logic 0, is usually optional. The logic 0 setting inFIG. 7 is illustrative only. Here, by setting the slave select signal SS64 to a low level voltage, the SPI interface is in a slave mode. In theslave mode, a master SPI device outputs the serial clock signal SCK 65to a slave SPI device. The slave select signal SS 64 is the slave selectinput of the multimedia module 61. Before a data transmission occurs,the slave select signal SS 64 must be set to logic low before thetransmission is completed. When the SPI interface is in a master mode,the serial clock signal SCK 65 becomes an output signal to supply clocksignal to other slave devices.

On FIG. 7 and FIG. 8, the internal supplied clock SCK 65 changes itspolarity according to the clock polarity control bit CPOL 610. SCK 65becomes a clock signal either having zero phase shift or one hundred andeighty degrees phase shift. If the clock phase control bit CPHA 611 iscleared, the odd numbered edges of the serial clock SCK input 65 causethe value of the serial data slave input MOSI 66 to be latched. Evennumbered edges cause the value previously latched to be shifted to theLSB of SPI buffers. On the contrary, if the clock phase control bit CPHA611 is set, the even numbered edges will cause the value of the serialdata slave input MOSI 66 to be latched. Odd numbered edges cause thevalue previously latched to be shifted to the LSB of SPI buffers. Thesample pulses SAMPLE are generated internally to force the latch tooccur. Moreover, the control register 69 in FIG. 6 may further comprisea direction control bit LSBFE 612 which determines whether the firstlatched bit is the MSB (Most Significant Bit) or LSB (Least SignificantBit). The operations of the SPI interface in master mode can be easilydeduced from the operations in the slave mode to those skilled in theart, and, therefore, are omitted herein.

FIG. 9 describes an image sensor interface according to anotherembodiment of the invention. Here, the image sensor interfacecommunicates image data between a multimedia module 92 and an imagesensor module 93. The image sensor interface comprises a sensor systemclock signal SENCLK 99, a sensor chip select signal SENCS# 94, ahorizontal data reference signal HSYNC 96, a vertical data referencesignal VSYNC 95, a sensor pixel clock signal PXCLK 97, and a sensor rawdata bus PXD [7:0] 98. The sensor system clock signal SENCLK 99 may bereplaced by an independent oscillation clock signal OSC-CLK 910. Thesensor module 93 operates the sensor system clock signal SENCLK 99according to the commands sent by the multimedia module 92. Moreover,the multimedia module 92 needs the sensor pixel clock PXCLK 97 todownload a large amount of sensor raw data synchronously. The verticaland horizontal data reference signals, VSYNC 95 and HSYNC 96, mayprovide assistance to the multimedia module 92 to locate the position ofeach image pixel. A serial image interface comprising a sensor serialdata signal and a sensor serial clock signal, similar to the serialinterface mentioned above, may replace this image sensor interface.

FIG. 10 illustrates a complete wireless multimedia mobile phone system103 according to the present invention. In this figure, the referencenumerals and annotations used are the same as those in the previousfigures. According to one embodiment, a multimedia mobile phone system103 comprises an upper part 104 and a lower part 105. The upper part 104comprises a main display module 45, a sub display module 44, amultimedia module 41, and an image sensor module 43. The lower part 105comprises a baseband module 42, an RF module 101, and a memory unit 102.There are several data buses between components in this embodiment. Aserial LCM bus 48 carries display data sent from the multimedia module41. A sensor bus 47 communicates image data between the multimediamodule 41 and the image sensor module 43. A serial baseband bus 46transmits and receives processing data between the multimedia module 41and the baseband module 42. The baseband module 42 couples with thememory unit 102 via a memory bus 107. There may be RF metal lines 106connected between the RF module 101 and the baseband module 42 forelectrical signal integrity purposes.

FIG. 11 shows another embodiment of the present invention. Here, samereference numerals and annotations are used as in the previous figures.The multimedia mobile phone system 103 mentioned in FIG. 10 furthercomprises a speaker 111 and a microphone 112. The baseband module 42receives audio signals from the microphone 112 and transmits the signaleither to the RF module 101 or to the multimedia module 41 for voicecontrol applications.

The baseband module 42 may transmit audio signals to the speaker 111either from the RF module 101 for voice applications, or from themultimedia module 41 for music applications, e.g., MP3. The multimediamobile phone system 103 may further comprise an earphone plug or anaudio output plug. Thus, the music data can be transferred via anenergy-saving and bandwidth-efficient serial bus.

Although certain embodiments of the invention are disclosed herein,various mobile phone systems may be implemented without departing thescope of the present invention. For example, the mentioned multimediaprocessing system may comprise an upper part and a lower part to fit ina clam-shell phone. On the other hand, the upper part and lower part canalso be integrated into a single PCB to fit in a bar-type phone.

According to the present invention, the mobile phone system shown inFIG. 10 can be made by utilizing a serial baseband interface. Differentadaptations of the system may be apparent to those skilled in the artwithout departing from the scope of the invention. For instance, it ispossible to implement the present invention in a clam-shell phone, aslide-up phone or a bar-type phone. The serial interface may utilize anexisting serial interface, e.g., I2C (Inter-Integrated Circuit) bus,RS232, or USB (Universal Serial Bus). Moreover, the fully display dataor image data formats may comprise 256 colors (RGB 3:3:2), 4096 colors(RGB 4:4:4), 64K colors (RGB 5:6:5) and 256K colors (RGB 6:6:6). Theserial interface may further comprise several control or clock signalsto have better transmission performance.

1. A multimedia processing system for communicating among a basebandmodule, an image sensor module, and at least one display module in amobile phone, comprising: a serial baseband interface that transmits andreceives processing data from said baseband module; an image sensorinterface that transmits and receives image data from said image sensormodule; a display interface that transmits and receives display datafrom said display module, wherein said display interface comprises adisplay write enable output, a display read enable output, and a displaytransceiver means to transmit and receive the display data, and at leastone register that includes a clock phase control bit, a clock polaritycontrol bit for assisting the serial baseband interface to accommodatedifferent interface standards, and a burst read mode control bit forbursting the serial baseband interface to read sequential processingdata from a multimedia module or from the baseband module.
 2. Themultimedia processing system of claim 1, wherein said image sensorinterface comprises at least one data line and one clock line.
 3. Themultimedia processing system of claim 1, wherein said display interfaceis a serial display interface.
 4. The multimedia processing system ofclaim 3, wherein said serial display interface comprises at least onedata line and one clock line.
 5. The multimedia processing system ofclaim 1, wherein said serial baseband interface comprises a serialperipheral interface that includes a clock signal, a data input, and adata output.
 6. The multimedia processing system of claim 5, whereinsaid serial peripheral interface further comprises a chip select input,and a slave input.
 7. The multimedia processing system of claim 1,wherein said serial baseband interface comprises a universalasynchronous receiver and transmitter (UART) interface.
 8. Themultimedia processing system of claim 7, wherein said universalasynchronous receiver and transmitter interface comprises a receivinginput and a transmitting output.
 9. The multimedia processing system ofclaim 1, wherein said image sensor interface comprises a horizontal datareference input, a vertical data reference input, and a plurality ofsensor raw data inputs.
 10. The multimedia processing system of claim 1,wherein said image sensor interface comprises a clock signal and atransceiver means to transmit and receive the image data.
 11. Themultimedia processing system of claim 1, wherein said display interfacecomprises a clock signal and a transceiver means to transmit and receivethe display data.
 12. The multimedia processing system of claim 1,wherein said display interface comprises a main display select outputand a sub-display select output.
 13. The multimedia processing system ofclaim 1, wherein said serial baseband interface further comprises: abypass input; and a baseband interrupt output.
 14. The multimediaprocessing system of claim 1, wherein the_serial baseband interface is aserial peripheral interface.
 15. A multimedia system for processingmultimedia data between an image sensor module and at least one displaymodule on a mobile phone, the multimedia data include at least onedisplay data, comprising: a multimedia processing module comprising aserial baseband interface and an image sensor interface wherein saidimage sensor interface transmits and receives image data from said imagesensor module; a baseband module that transmits and receives processingdata from said multimedia processing module via said serial basebandinterface, said baseband module comprising a display interface, saiddisplay interface comprising a display write enable output, a displayread enable output, and a display transceiver means to transmit andreceive the display data; and at least one register that includes aclock phase control bit, a clock polarity control bit for assisting aserial peripheral interface (SPI) to accommodate different interfacestandards, and a burst read mode control bit for bursting the SPIinterface to read sequential processing data from the multimediaprocessing module or from the baseband module.
 16. The multimediaprocessing system of claim 15, wherein said display interface is aserial display interface.
 17. The multimedia processing system of claim16, wherein said serial display interface comprises at least one dataline and one clock line.
 18. The multimedia processing system of claim15, wherein said multimedia processing module comprises a displayinterface to transmit and receive said display data from display module.19. The multimedia processing system of claim 18, wherein said displayinterface is a serial display interface.
 20. The multimedia processingsystem of claim 19, wherein said serial display interface comprises atleast one data line and one clock line.
 21. The multimedia processingsystem of claim 15, wherein said baseband module comprises a bypassoutput, and said multimedia processing module comprises a bypass input,a first display interface, and a second display interface wherein saidfirst display interface passes display data directly to said seconddisplay interface when said baseband module activates said bypassoutput.
 22. The multimedia processing system of claim 21, wherein saiddisplay interface is a serial display interface.
 23. The multimediaprocessing system of claim 15, wherein said display module comprises atleast one display select input.
 24. The multimedia processing system ofclaim 23, further comprising: a main display module; and a sub-displaymodule wherein said display select input activates either said maindisplay module or said sub-display module or both.
 25. The multimediaprocessing system of claim 15, wherein said display module is a liquidcrystal display module.
 26. The multimedia processing system of claim15, wherein said image sensor module is a CMOS or a CCD image sensormodule.
 27. The multimedia processing system of claim 15, furthercomprising: an RF module that transmits and receives at least one radiofrequency signal; and a memory unit having a memory bus wherein saidbaseband module converts said radio frequency signal into digital dataand stores said digital data in said memory unit via said memory bus.28. The multimedia processing system of claim 15, wherein said mobilephone is a clamshell phone.
 29. The multimedia processing system ofclaim 15, wherein said mobile phone is a slide-up phone or a bar-typephone.